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# Time

`public class Time`
`extends Object` ``

java.lang.Object
↳ | android.text.format.Time

This class is deprecated.
Use `GregorianCalendar` instead.

An alternative to the `Calendar` and `GregorianCalendar` classes. An instance of the Time class represents a moment in time, specified with second precision. It is modelled after struct tm. This class is not thread-safe and does not consider leap seconds.

This class has a number of issues and it is recommended that `GregorianCalendar` is used instead.

Known issues:

- For historical reasons when performing time calculations all arithmetic currently takes place using 32-bit integers. This limits the reliable time range representable from 1902 until 2037.See the wikipedia article on the Year 2038 problem for details. Do not rely on this behavior; it may change in the future.
- Calling `switchTimezone(java.lang.String)` on a date that cannot exist, such as a wall time that was skipped due to a DST transition, will result in a date in 1969 (i.e. -1, or 1 second before 1st Jan 1970 UTC).
- Much of the formatting / parsing assumes ASCII text and is therefore not suitable for use with non-ASCII scripts.
- No support for pseudo-zones like "GMT-07:00".

## Summary

### Constants
`int` | `EPOCH_JULIAN_DAY` The Julian day of the epoch, that is, January 1, 1970 on the Gregorian calendar.
`int` | `FRIDAY`
`int` | `HOUR`
`int` | `MINUTE`
`int` | `MONDAY`
`int` | `MONDAY_BEFORE_JULIAN_EPOCH` The Julian day of the Monday in the week of the epoch, December 29, 1969 on the Gregorian calendar.
`int` | `MONTH`
`int` | `MONTH_DAY`
`int` | `SATURDAY`
`int` | `SECOND`
`int` | `SUNDAY`
`int` | `THURSDAY`
`String` | `TIMEZONE_UTC`
`int` | `TUESDAY`
`int` | `WEDNESDAY`
`int` | `WEEK_DAY`
`int` | `WEEK_NUM`
`int` | `YEAR`
`int` | `YEAR_DAY`

### Fields
`public boolean` | `allDay` True if this is an allDay event.
`public long` | `gmtoff` Offset in seconds from UTC including any DST offset.
`public int` | `hour` Hour of day [0-23]
`public int` | `isDst` This time is in daylight savings time.
`public int` | `minute` Minute [0-59]
`public int` | `month` Month [0-11]
`public int` | `monthDay` Day of month [1-31]
`public int` | `second` Seconds [0-61] (2 leap seconds allowed)
`public String` | `timezone` The timezone for this Time.
`public int` | `weekDay` Day of week [0-6]
`public int` | `year` Year.
`public int` | `yearDay` Day of year [0-365]

### Public constructors
`Time(String timezoneId)` Construct a Time object in the timezone named by the string argument "timezone".
`Time()` Construct a Time object in the default timezone.
`Time(Time other)` A copy constructor.

### Public methods
`boolean` | `after(Time that)` Returns true if the time represented by this Time object occurs after the given time.
`boolean` | `before(Time that)` Returns true if the time represented by this Time object occurs before the given time.
`void` | `clear(String timezoneId)` Clears all values, setting the timezone to the given timezone.
`static int` | `compare(Time a, Time b)` Compare two `Time` objects and return a negative number if `a` is less than `b`, a positive number if `a` is greater than `b`, or 0 if they are equal.
`String` | `format(String format)` Print the current value given the format string provided.
`String` | `format2445()` Format according to RFC 2445 DATE-TIME type.
`String` | `format3339(boolean allDay)` Return a string in the RFC 3339 format.
`int` | `getActualMaximum(int field)` Return the maximum possible value for the given field given the value of the other fields.
`static String` | `getCurrentTimezone()` Returns the timezone string that is currently set for the device.
`static int` | `getJulianDay(long millis, long gmtoffSeconds)` This method is deprecated. Use `JulianFields.JULIAN_DAY` instead.
`static int` | `getJulianMondayFromWeeksSinceEpoch(int week)` Takes a number of weeks since the epoch and calculates the Julian day of the Monday for that week.
`int` | `getWeekNumber()` Computes the week number according to ISO 8601.
`static int` | `getWeeksSinceEpochFromJulianDay(int julianDay, int firstDayOfWeek)` Returns the week since `EPOCH_JULIAN_DAY` (Jan 1, 1970) adjusted for first day of week.
`static boolean` | `isEpoch(Time time)` Returns true if the instant of the supplied time would be for the Gregorian calendar date January 1, 1970 for a user observing UTC , i.e.
`long` | `normalize(boolean ignoreDst)` Ensures the values in each field are in range.
`boolean` | `parse(String s)` Parses a date-time string in either the RFC 2445 format or an abbreviated format that does not include the "time" field.
`boolean` | `parse3339(String s)` Parse a time in RFC 3339 format.
`void` | `set(Time that)` Copy the value of that to this Time object.
`void` | `set(int second, int minute, int hour, int monthDay, int month, int year)` Sets the fields.
`void` | `set(int monthDay, int month, int year)` Sets the date from the given fields.
`void` | `set(long millis)` Sets the fields in this Time object given the UTC milliseconds.
`long` | `setJulianDay(int julianDay)` Sets the time from the given Julian day number, which must be based on the same timezone that is set in this Time object.
`void` | `setToNow()` Sets the time of the given Time object to the current time.
`void` | `switchTimezone(String timezone)` Convert this time object so the time represented remains the same, but is instead located in a different timezone.
`long` | `toMillis(boolean ignoreDst)` Converts this time to milliseconds.
`String` | `toString()` Return the current time in YYYYMMDDTHHMMSS<tz> format

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Constants

### EPOCH_JULIAN_DAY

    public static final int EPOCH_JULIAN_DAY

The Julian day of the epoch, that is, January 1, 1970 on the Gregorian calendar.

Constant Value: 2440588 (0x00253d8c)

### FRIDAY

    public static final int FRIDAY

Constant Value: 5 (0x00000005)

### HOUR

    public static final int HOUR

Constant Value: 3 (0x00000003)

### MINUTE

    public static final int MINUTE

Constant Value: 2 (0x00000002)

### MONDAY

    public static final int MONDAY

Constant Value: 1 (0x00000001)

### MONDAY_BEFORE_JULIAN_EPOCH

    public static final int MONDAY_BEFORE_JULIAN_EPOCH

The Julian day of the Monday in the week of the epoch, December 29, 1969 on the Gregorian calendar.

Constant Value: 2440585 (0x00253d89)

### MONTH

    public static final int MONTH

Constant Value: 5 (0x00000005)

### MONTH_DAY

    public static final int MONTH_DAY

Constant Value: 4 (0x00000004)

### SATURDAY

    public static final int SATURDAY

Constant Value: 6 (0x00000006)

### SECOND

    public static final int SECOND

Constant Value: 1 (0x00000001)

### SUNDAY

    public static final int SUNDAY

Constant Value: 0 (0x00000000)

### THURSDAY

    public static final int THURSDAY

Constant Value: 4 (0x00000004)

### TIMEZONE_UTC

    public static final String TIMEZONE_UTC

Constant Value: "UTC"

### TUESDAY

    public static final int TUESDAY

Constant Value: 2 (0x00000002)

### WEDNESDAY

    public static final int WEDNESDAY

Constant Value: 3 (0x00000003)

### WEEK_DAY

    public static final int WEEK_DAY

Constant Value: 7 (0x00000007)

### WEEK_NUM

    public static final int WEEK_NUM

Constant Value: 9 (0x00000009)

### YEAR

    public static final int YEAR

Constant Value: 6 (0x00000006)

### YEAR_DAY

    public static final int YEAR_DAY

Constant Value: 8 (0x00000008)

## Fields

### allDay

    public boolean allDay

True if this is an allDay event. The hour, minute, second fields are all zero, and the date is displayed the same in all time zones.

### gmtoff

    public long gmtoff

Offset in seconds from UTC including any DST offset.

### hour

    public int hour

Hour of day [0-23]

### isDst

    public int isDst

This time is in daylight savings time. One of:

- positive - in dst
- 0 - not in dst
- negative - unknown

### minute

    public int minute

Minute [0-59]

### month

    public int month

Month [0-11]

### monthDay

    public int monthDay

Day of month [1-31]

### second

    public int second

Seconds [0-61] (2 leap seconds allowed)

### timezone

    public String timezone

The timezone for this Time. Should not be null.

### weekDay

    public int weekDay

Day of week [0-6]

### year

    public int year

Year. For example, 1970.

### yearDay

    public int yearDay

Day of year [0-365]

## Public constructors

### Time

    public Time (String timezoneId)

Construct a Time object in the timezone named by the string argument "timezone". The time is initialized to Jan 1, 1970.

Parameters
`timezoneId` | `String`: string containing the timezone to use.

See also:

- `TimeZone`

### Time

    public Time ()

Construct a Time object in the default timezone. The time is initialized to Jan 1, 1970.

### Time

    public Time (Time other)

A copy constructor. Construct a Time object by copying the given Time object. No normalization occurs.

## Public methods

### after

    public boolean after (Time that)

Returns true if the time represented by this Time object occurs after the given time.

Equivalent to `Time.compare(this, that) > 0`. See `compare(android.text.format.Time, android.text.format.Time)` for details.

Parameters
`that` | `Time`: a given Time object to compare against

Returns
`boolean` | true if this time is greater than the given time

### before

    public boolean before (Time that)

Returns true if the time represented by this Time object occurs before the given time.

Equivalent to `Time.compare(this, that) < 0`. See `compare(android.text.format.Time, android.text.format.Time)` for details.

Parameters
`that` | `Time`: a given Time object to compare against

Returns
`boolean` | true if this time is less than the given time

### clear

    public void clear (String timezoneId)

Clears all values, setting the timezone to the given timezone. Sets isDst to a negative value to mean "unknown".

Parameters
`timezoneId` | `String`: the timezone to use.

### compare

    public static int compare (Time a,
                    Time b)

Compare two `Time` objects and return a negative number if `a` is less than `b`, a positive number if `a` is greater than `b`, or 0 if they are equal.

This method can return an incorrect answer when the date / time fields of either `Time` have been set to a local time that contradicts the available timezone information.

Parameters
`a` | `Time`: first `Time` instance to compare
`b` | `Time`: second `Time` instance to compare

Returns
`int` | a negative result if `a` is earlier, a positive result if `b` is earlier, or 0 if they are equal.

Throws
`NullPointerException` | if either argument is `null`
`IllegalArgumentException` | if `allDay` is true but `hour`, `minute`, and `second` are not 0.

### format

    public String format (String format)

Print the current value given the format string provided. See man strftime for what means what. The final string must be less than 256 characters.

Parameters
`format` | `String`: a string containing the desired format.

Returns
`String` | a String containing the current time expressed in the current locale.

### format2445

    public String format2445 ()

Format according to RFC 2445 DATE-TIME type.

The same as format("%Y%m%dT%H%M%S"), or format("%Y%m%dT%H%M%SZ") for a Time with a timezone set to "UTC".

Returns
`String` |

### format3339

    public String format3339 (boolean allDay)

Return a string in the RFC 3339 format.

If allDay is true, expresses the time as Y-M-D

Otherwise, if the timezone is UTC, expresses the time as Y-M-D-T-H-M-S UTC

Otherwise the time is expressed the time as Y-M-D-T-H-M-S +- GMT

Parameters
`allDay` | `boolean`

Returns
`String` | string in the RFC 3339 format.

### getActualMaximum

    public int getActualMaximum (int field)

Return the maximum possible value for the given field given the value of the other fields. Requires that it be normalized for MONTH_DAY and YEAR_DAY.

Parameters
`field` | `int`: one of the constants for HOUR, MINUTE, SECOND, etc.

Returns
`int` | the maximum value for the field.

### getCurrentTimezone

    public static String getCurrentTimezone ()

Returns the timezone string that is currently set for the device.

Returns
`String` |

### getJulianDay

    public static int getJulianDay (long millis,
                    long gmtoffSeconds)

This method is deprecated.
Use `JulianFields.JULIAN_DAY` instead.

Computes the Julian day number for a point in time in a particular timezone. The Julian day for a given calendar date is the same for every timezone. For example, the Julian day for July 1, 2008 is 2454649.

Callers must pass the time in UTC millisecond (as can be returned by `toMillis(boolean)` or `normalize(boolean)`) and the offset from UTC of the timezone in seconds at that time (as might be in `gmtoff`).

The Julian day is useful for testing if two events occur on the same calendar date and for determining the relative time of an event from the present ("yesterday", "3 days ago", etc.).

Parameters
`millis` | `long`: the time in UTC milliseconds
`gmtoffSeconds` | `long`: the offset from UTC in seconds

Returns
`int` | the Julian day

### getJulianMondayFromWeeksSinceEpoch

    public static int getJulianMondayFromWeeksSinceEpoch (int week)

Takes a number of weeks since the epoch and calculates the Julian day of the Monday for that week. This assumes that the week containing the `EPOCH_JULIAN_DAY` is considered week 0. It returns the Julian day for the Monday week weeks after the Monday of the week containing the epoch.

Parameters
`week` | `int`: Number of weeks since the epoch

Returns
`int` | The julian day for the Monday of the given week since the epoch

### getWeekNumber

    public int getWeekNumber ()

Computes the week number according to ISO 8601. The current Time object must already be normalized because this method uses the yearDay and weekDay fields.

In IS0 8601, weeks start on Monday. The first week of the year (week 1) is defined by ISO 8601 as the first week with four or more of its days in the starting year. Or equivalently, the week containing January 4. Or equivalently, the week with the year's first Thursday in it.

The week number can be calculated by counting Thursdays. Week N contains the Nth Thursday of the year.

Returns
`int` | the ISO week number.

### getWeeksSinceEpochFromJulianDay

    public static int getWeeksSinceEpochFromJulianDay (int julianDay,
                    int firstDayOfWeek)

Returns the week since `EPOCH_JULIAN_DAY` (Jan 1, 1970) adjusted for first day of week. This takes a julian day and the week start day and calculates which week since `EPOCH_JULIAN_DAY` that day occurs in, starting at 0. *Do not* use this to compute the ISO week number for the year.

Parameters
`julianDay` | `int`: The julian day to calculate the week number for
`firstDayOfWeek` | `int`: Which week day is the first day of the week, see `SUNDAY`

Returns
`int` | Weeks since the epoch

### isEpoch

    public static boolean isEpoch (Time time)

Returns true if the instant of the supplied time would be for the Gregorian calendar date January 1, 1970 for a user observing UTC , i.e. the timezone of the time object is ignored.

See `getJulianDay(long, long)` for how to determine the Julian day for the timezone of the time object.

This method can return an incorrect answer when the date / time fields have been set to a local time that contradicts the available timezone information.

Parameters
`time` | `Time`: the time to test

Returns
`boolean` | true if epoch.

### normalize

    public long normalize (boolean ignoreDst)

Ensures the values in each field are in range. For example if the current value of this calendar is March 32, normalize() will convert it to April 1. It also fills in weekDay, yearDay, isDst and gmtoff.

If "ignoreDst" is true, then this method sets the "isDst" field to -1 (the "unknown" value) before normalizing. It then computes the time in milliseconds and sets the correct value for "isDst" if the fields resolve to a valid date / time.

See `toMillis(boolean)` for more information about when to use `true` or `false` for "ignoreDst" and when `-1` might be returned.

Parameters
`ignoreDst` | `boolean`

Returns
`long` | the UTC milliseconds since the epoch, or `-1`

### parse

    public boolean parse (String s)

Parses a date-time string in either the RFC 2445 format or an abbreviated format that does not include the "time" field. For example, all of the following strings are valid:

- "20081013T160000Z"
- "20081013T160000"
- "20081013"

Returns whether or not the time is in UTC (ends with Z). If the string ends with "Z" then the timezone is set to UTC. If the date-time string included only a date and no time field, then the `allDay` field of this Time class is set to true and the `hour`, `minute`, and `second` fields are set to zero; otherwise (a time field was included in the date-time string) `allDay` is set to false. The fields `weekDay`, `yearDay`, and `gmtoff` are always set to zero, and the field `isDst` is set to -1 (unknown). To set those fields, call `normalize(boolean)` after parsing. To parse a date-time string and convert it to UTC milliseconds, do something like this:

       Time time = new Time();
       String date = "20081013T160000Z";
       time.parse(date);
       long millis = time.normalize(false);

Parameters
`s` | `String`: the string to parse

Returns
`boolean` | true if the resulting time value is in UTC time

Throws
`TimeFormatException` | if s cannot be parsed.

### parse3339

    public boolean parse3339 (String s)

Parse a time in RFC 3339 format. This method also parses simple dates (that is, strings that contain no time or time offset). For example, all of the following strings are valid:

- "2008-10-13T16:00:00.000Z"
- "2008-10-13T16:00:00.000+07:00"
- "2008-10-13T16:00:00.000-07:00"
- "2008-10-13"

If the string contains a time and time offset, then the time offset will be used to convert the time value to UTC.

If the given string contains just a date (with no time field), then the `allDay` field is set to true and the `hour`, `minute`, and `second` fields are set to zero.

Returns true if the resulting time value is in UTC time.

Parameters
`s` | `String`: the string to parse

Returns
`boolean` | true if the resulting time value is in UTC time

Throws
`TimeFormatException` | if s cannot be parsed.

### set

    public void set (Time that)

Copy the value of that to this Time object. No normalization happens.

Parameters
`that` | `Time`

### set

    public void set (int second,
                    int minute,
                    int hour,
                    int monthDay,
                    int month,
                    int year)

Sets the fields. Sets weekDay, yearDay and gmtoff to 0, and isDst to -1. Call `normalize(boolean)` if you need those.

Parameters
`second` | `int`
`minute` | `int`
`hour` | `int`
`monthDay` | `int`
`month` | `int`
`year` | `int`

### set

    public void set (int monthDay,
                    int month,
                    int year)

Sets the date from the given fields. Also sets allDay to true. Sets weekDay, yearDay and gmtoff to 0, and isDst to -1. Call `normalize(boolean)` if you need those.

Parameters
`monthDay` | `int`: the day of the month (in the range [1,31])
`month` | `int`: the zero-based month number (in the range [0,11])
`year` | `int`: the year

### set

    public void set (long millis)

Sets the fields in this Time object given the UTC milliseconds. After this method returns, all the fields are normalized. This also sets the "isDst" field to the correct value.

Parameters
`millis` | `long`: the time in UTC milliseconds since the epoch.

### setJulianDay

    public long setJulianDay (int julianDay)

Sets the time from the given Julian day number, which must be based on the same timezone that is set in this Time object. The "gmtoff" field need not be initialized because the given Julian day may have a different GMT offset than whatever is currently stored in this Time object anyway. After this method returns all the fields will be normalized and the time will be set to 12am at the beginning of the given Julian day.

The only exception to this is if 12am does not exist for that day because of daylight saving time. For example, Cairo, Eqypt moves time ahead one hour at 12am on April 25, 2008 and there are a few other places that also change daylight saving time at 12am. In those cases, the time will be set to 1am.

Parameters
`julianDay` | `int`: the Julian day in the timezone for this Time object

Returns
`long` | the UTC milliseconds for the beginning of the Julian day

### setToNow

    public void setToNow ()

Sets the time of the given Time object to the current time.

### switchTimezone

    public void switchTimezone (String timezone)

Convert this time object so the time represented remains the same, but is instead located in a different timezone. This method automatically calls normalize() in some cases.

This method can return incorrect results if the date / time cannot be normalized.

Parameters
`timezone` | `String`

### toMillis

    public long toMillis (boolean ignoreDst)

Converts this time to milliseconds. Suitable for interacting with the standard java libraries. The time is in UTC milliseconds since the epoch. This does an implicit normalization to compute the milliseconds but does not change any of the fields in this Time object. If you want to normalize the fields in this Time object and also get the milliseconds then use `normalize(boolean)`.

If "ignoreDst" is false, then this method uses the current setting of the "isDst" field and will adjust the returned time if the "isDst" field is wrong for the given time. See the sample code below for an example of this.

If "ignoreDst" is true, then this method ignores the current setting of the "isDst" field in this Time object and will instead figure out the correct value of "isDst" (as best it can) from the fields in this Time object. The only case where this method cannot figure out the correct value of the "isDst" field is when the time is inherently ambiguous because it falls in the hour that is repeated when switching from Daylight-Saving Time to Standard Time.

Here is an example where `toMillis(true)` adjusts the time, assuming that DST changes at 2am on Sunday, Nov 4, 2007.

     Time time = new Time();
     time.set(4, 10, 2007);  // set the date to Nov 4, 2007, 12am
     time.normalize(false);       // this sets isDst = 1
     time.monthDay += 1;     // changes the date to Nov 5, 2007, 12am
     millis = time.toMillis(false);   // millis is Nov 4, 2007, 11pm
     millis = time.toMillis(true);    // millis is Nov 5, 2007, 12am

To avoid this problem, use `toMillis(true)` after adding or subtracting days or explicitly setting the "monthDay" field. On the other hand, if you are adding or subtracting hours or minutes, then you should use `toMillis(false)`.

You should also use `toMillis(false)` if you want to read back the same milliseconds that you set with `set(long)` or `set(android.text.format.Time)` or after parsing a date string.

This method can return `-1` when the date / time fields have been set to a local time that conflicts with available timezone information. For example, when daylight savings transitions cause an hour to be skipped: times within that hour will return `-1` if isDst = `-1`.

Parameters
`ignoreDst` | `boolean`

Returns
`long` |

### toString

    public String toString ()

Return the current time in YYYYMMDDTHHMMSS<tz> format

Returns
`String` | a string representation of the object.

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